I think it better be a turbine because from another thread a while back about a similar flight in a piston twin someone indicated they don't have 100LL there .
Could be wrong. Unless its a TBM or PC12 with that range it sounds like a trip ending in the water unless you have some excellent extra fuel/ferry tank system.
Sounds like a cool adventure! I believe the Jabiru can also use automotive fuel, there might however be some limitations regarding the ethanol content. In case they don't have 100LL, this might be an option to look into.
My I ask why you want to go there? 'Just because' or is there a specific reason?